我阅读了一些帖子，发现reQuery()已被弃用，有些建议使用SwapCursor()或ChangeCursor()。
我有一个收藏夹按钮，点击它更新数据库并更改按钮的颜色。当我滚动并返回特定视图（和按钮）时，颜色被重置。 我知道这是因为视图被回收了。我有一个基于DB列值的条件来设置Button的颜色。
我希望view在按下按钮后从DB获取更新值。我必须刷新/重新查询Cursor / DB。
如何使用CursorAdapter记住我的分钟。 API是19？
更新 CursorAdapter代码：
公共类ToDoCursorAdapter扩展了CursorAdapter {
SparseBooleanArray selectionArrayAr = new SparseBooleanArray();
SparseBooleanArray selectionArrayRef = new SparseBooleanArray();
SparseBooleanArray selectionArrayFav = new SparseBooleanArray();
//Boolean isSet = false;
private MainButtons_Interface mAdapterCallback;
public ToDoCursorAdapter(Context context, Cursor cursor) {
super(context, cursor, 0);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
ViewHolderItem viewHolder = new ViewHolderItem();
View rowView = LayoutInflater.from(context).inflate(R.layout.listview, parent, false);
viewHolder.engTextV = (TextView) rowView.findViewById(R.id.engText);
viewHolder.arTextV = (TextView) rowView.findViewById(R.id.arabText);
viewHolder.buttonIAV = (Button) rowView.findViewById(R.id.buttonIA); //For Arabic Text
viewHolder.refTextV = (TextView) rowView.findViewById(R.id.refText);
viewHolder.buttonIRV = (Button) rowView.findViewById(R.id.buttonIR); //For Ref Text
viewHolder.buttonIFV = (ImageButton) rowView.findViewById(R.id.buttonF);
rowView.setTag(viewHolder);
return rowView;
}
@Override
public void bindView(final View view, final Context context, final Cursor cursor) {
final ViewHolderItem viewHolder = (ViewHolderItem) view.getTag();
String arabic = cursor.getString(cursor.getColumnIndexOrThrow("PlainArab_Text")).trim().replaceAll("[\n]{2,}", "TWOFEEDS").replaceAll("\n", " ").replaceAll(" +", " ").replaceAll("<br/>", "\n").replaceAll("TWOFEEDS", "\n") + "\n";
String english = cursor.getString(cursor.getColumnIndexOrThrow("PlainEng_Text")).trim().replaceAll("[\n]{2,}", "TWOFEEDS").replaceAll("\n", " ").replaceAll(" +", " ").replaceAll("<br/>", "\n").replaceAll("TWOFEEDS", "\n") + "\n";
String ref = cursor.getString(cursor.getColumnIndexOrThrow("REF")).trim().replaceAll("<br/> <br/>", " ").replaceAll("<br/>", "\n");
final Integer HadithID = cursor.getInt(cursor.getColumnIndexOrThrow("ID"));
final Integer IsFav = cursor.getInt(cursor.getColumnIndexOrThrow("IsFavorite"));
viewHolder.arTextV.setText(arabic);
viewHolder.engTextV.setText(english);
viewHolder.refTextV.setText(ref);
final int position = cursor.getPosition();
boolean isSelectedA = selectionArrayAr.get(position);
boolean isSelectedR = selectionArrayRef.get(position);
boolean isSelectedF = selectionArrayFav.get(position);
if (isSelectedA) {
viewHolder.arTextV.setVisibility(view.GONE);
viewHolder.buttonIAV.setText("Show Arabic Version");
} else if (!isSelectedA){
viewHolder.arTextV.setVisibility(view.VISIBLE);
viewHolder.buttonIAV.setText("Hide Arabic Version");
}
if (isSelectedR) {
viewHolder.refTextV.setVisibility(view.GONE);
viewHolder.buttonIRV.setText("Show Refrence");
} else if (!isSelectedR){
viewHolder.refTextV.setVisibility(view.VISIBLE);
viewHolder.buttonIRV.setText("Hide Refrence");
}
//boolean isSelectedF = selectionArrayFav.get(position);
if(isSelectedF) {
viewHolder.buttonIFV.setImageResource(R.drawable.favoritebutton_afterclick);
} else if (!isSelectedF){
viewHolder.buttonIFV.setImageResource(R.drawable.favoritebutton);
}
//Arabic Button
viewHolder.buttonIAV.setOnClickListener(
new View.OnClickListener()
{ @Override
public void onClick(View v) {
boolean isSelectedAc = selectionArrayAr.get(position);
if(!isSelectedAc) {
viewHolder.arTextV.setVisibility(v.GONE);
viewHolder.buttonIAV.setText("Show Arabic Version");
setSelectedAr(position, true);
} else if (isSelectedAc){
viewHolder.arTextV.setVisibility(v.VISIBLE);
setSelectedAr(position, false);
viewHolder.buttonIAV.setText("Hide Arabic version");
}
}
}
);
//Ref Button
viewHolder.buttonIRV.setOnClickListener(
new View.OnClickListener()
{ @Override
public void onClick(View v) {
boolean isSelectedRc = selectionArrayRef.get(position);
if(!isSelectedRc) {
viewHolder.refTextV.setVisibility(v.GONE);
viewHolder.buttonIRV.setText("Show Reference");
setSelectedRef(position, true);
} else if (isSelectedRc){
viewHolder.refTextV.setVisibility(v.VISIBLE);
setSelectedRef(position, false);
viewHolder.buttonIRV.setText("Hide Reference");
}
}
}
);
//Fav Button
viewHolder.buttonIFV.setOnClickListener(
new View.OnClickListener()
{ @Override
public void onClick(View v) {
boolean isSelectedF = selectionArrayFav.get(position);
boolean IsSet = ((ListViewActivity) context).addRemFav(HadithID);
String mess ="";
if(IsSet){
mess = "Hadith add to Favorite list";
} else if(!IsSet){
mess = "Hadith removed from Favorite list";
}
if(!isSelectedF) {
viewHolder.buttonIFV.setImageResource(R.drawable.favoritebutton_afterclick);
setSelectedF(position, true);
} else if (isSelectedF){
viewHolder.buttonIFV.setImageResource(R.drawable.favoritebutton);
setSelectedF(position, false);
}
Toast.makeText(v.getContext(), mess, Toast.LENGTH_SHORT).show();
}
}
);
}
// our ViewHolder.
static class ViewHolderItem {
TextView engTextV;
TextView arTextV;
TextView refTextV;
Button buttonIAV;
Button buttonIRV;
ImageButton buttonIFV;
}
// Method to mark items in selection
public void setSelectedAr(int position, boolean isSelected) {
selectionArrayAr.put(position, isSelected);
}
public void setSelectedRef(int position, boolean isSelected) {
selectionArrayRef.put(position, isSelected);
}
public void setSelectedF(int position, boolean isSelected) {
selectionArrayFav.put(position, isSelected);
}
更新
我将此逻辑添加到我的函数中，该函数在单击Button时被调用。
Cursor todoCursor1 = hadDB.rawQuery("SELECT ID as _id, * FROM HAD_TABLE WHERE ID < 7001 ", null);
todoAdapter.changeCursor(todoCursor1);
基本上，您只需要重新查询数据库，以便获得更新的记录/数据，然后用新的光标更改当前光标，todoCursor1就是我的情况。
此外，changeCursor()将关闭当前光标，如果您想要返回旧光标，则应使用swapCursor()，因为它会返回旧光标。
现在我唯一想知道的是，如果这适用于API 19及更高版本。
答案 0 :(得分：0)
我将此逻辑添加到我的函数中，该函数在单击Button时被调用。
Cursor todoCursor1 = hadDB.rawQuery("SELECT ID as _id, * FROM HAD_TABLE WHERE ID < 7001 ", null);
todoAdapter.changeCursor(todoCursor1);
基本上，您只需要重新查询数据库，以便获得更新的记录/数据，然后用新的光标更改当前光标，todoCursor1就是我的情况。
此外，changeCursor()将关闭当前光标，如果您想要返回旧光标，则应使用swapCursor()，因为它会返回旧光标。